Hi,
My name is Rodolfo, working on Revit content developer since 2010.
You didn't mention how many products you want to be modeled and grouped on the fixed price you need.
As 100usd is too much for a single family I guess you are posting more than 2-3 products. For one Curtain Track, I would bid 45usd as a guess. Then, if more product are needed there are a few items to review first:
1-Parametrization ( a single family containing several product types),
2-standards to be followed (adding standard´s specific parameters, CoBie, IFC export, etc, plus the QC procedures ).
3-Looking only geometry, representation of your products is not complex and indeed similar between them. This is an advantage as allows the use of the skeleton of one, to build another, wich traduces in less modeling time.
4-Also, is a very high possibility of merging types in a single family. with the creation of a type catalog. ( less modeling time, less files to download for the end user, ability to change from one type to another from a drop-down list within Revit project.)
If posible, please send a list of products to be modeled, plus DWG or PDF specifications so I could prepare a quotation based on what I have explain before.
Best Regards,
Rodolfo